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Carrying out some EICR on a commercial/industrial site.
Previous records state the structural steel is bonded, and visually I can see 4x 25mm Earth wires leaving the main earth bar, I cannot trace the one going to the steel , though I suspect one of these does.
How do I prove this? Is it a case of isolating all power( an operational minefield) and testing between the steel and out going 25mm earth wires?

On a second point if I may, neutrals not in order on a large 3 phase DB so I disconnected neutral link bar and tested NxE at outlet end (500v) and still got a reading at less than one ohm.
The cables are in good condition , and the breaker dosent trip when in use , so I do not think it is a dead short.
Any body any pointers on these? It may be I'm missing something simple, my head is bursting today! And any help/ is greatly appreciated .
Thanks in advance
 
Carrying out some EICR on a commercial/industrial site.
Previous records state the structural steel is bonded, and visually I can see 4x 25mm Earth wires leaving the main earth bar, I cannot trace the one going to the steel , though I suspect one of these does.
How do I prove this? Is it a case of isolating all power( an operational minefield) and testing between the steel and out going 25mm earth wires?

On a second point if I may, neutrals not in order on a large 3 phase DB so I disconnected neutral link bar and tested NxE at outlet end (500v) and still got a reading at less than one ohm.
The cables are in good condition , and the breaker dosent trip when in use , so I do not think it is a dead short.
Any body any pointers on these? It may be I'm missing something simple, my head is bursting today! And any help/ is greatly appreciated .
Thanks in advance
Are you oingthis EICR as part of your apprenticeship, or on the QT for some extra dosh?
 
For the bonding just use a wander lead and test back to the MET.

As for the N-E fault, the MCB won't trip but an RCD would.

Are you competent to carry out periodic inspections?
 
wandering lead method and sometimes visual verification
(once during a christmas shutdown some copper scrounging git clipped all the bonding conductors from all the i beams) we found them missing on startup inspection and they were replaced.
 

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